So it’s over, the planet will likely be rendered uninhabitable probably within the next century. Is there any point in even having a new child now?
I'm not sure how you come to that conclusion but the planet won't be uninhabitable. Certain areas will be uninhabitable and there will probably be massive displacement of people paired with food shortages. But complete resignation is not only unhelpful but also unwarranted.
"...It became part of the larger Zuiderzee Works in which four polders totaling 2,500 square kilometres (965 sq mi) were reclaimed from the sea."
No scientific arguments exist that would support this claim. Some land area might be lost, but other areas will become accessible through warming (think Siberia, Greenland, Canada).
On the contrary, we should expect the planet to become more hospitable, with higher crop yields, more plants and better average climate for human life on land mass.
The human population increase is the real problem.
Moreover, in many places of the world food is produced inefficiently, so there is a lot of additional food that can be grown even without increasing land use.
(currently there is enough food grown to feed everyone, it is logistics problem now)